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Design and Implementation of SIP Internet Call-setup System using Seven States  

Shin, Yong-Kyoung (LG전자 SW Center)
Kim, Sang-Wook (경북대학교 전자전기컴퓨터학부)
Publication Information
Journal of KIISE:Computing Practices and Letters / v.13, no.5, 2007 , pp. 300-310 More about this Journal
Abstract
The Session Initiation Protocol (SIP) is one of the major protocols used in call-setup over IP telephony. The SIP-signaled calls use many-sided states according to a request of user. In this paper, we suggest seven states and some events that help developers to design and implement new applications efficiently. And they enable an object-oriented design of the system. If you design the call-setup procedure only by the processing model suggested in RFC 3261 over commercial network, a fatal error may occur in the system because of heavy data traffic or unpredicted exception cases. However, according to the suggested seven states, if they are predefined events in the current system state, the standardized processing routine is executed. Otherwise, they can be processed by the exception routine in system. All event processing routines are designed and implemented using Finite State Machine (FSM).
Keywords
State; SIP; Call-Setup; FSM;
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